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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Odd question, it pretty much answers itself. There generally has to be a registration mark or some physical means of aligning a PCB during manufacture that will allow the solder mask to be aligned properly so that the solder protection compound (the green stuff on a typical PCB card) will be masked off of the points that require soldering.
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